Dental appliance.



' R BRADBURY. DENTAL APPLIANCE. APPLICATION FILED 001216,

Patented Apr. 27, 1909.

UNITED STATES PATENT onruon.

Specification of Letters Patent. Application filed October 15, 1908.

Patented April 27, 1909.

Serial No. 457,919.

To all whom it may concern:

Be it known that I, RICHARD BRADBURY, a subject of the King of GreatBritain, residing at Broadstairs, England, have invented certain new anduseful Improvements in Dental Appliances, of which the following is aspecification. i

This invention relates to dental syringes or enemas and has for itsobject to construct a dental syringe or enema adapted to inject atubular needle 0 which passes through and l is supported by a holder orcap P screwed on a pro ecting part of the piece D. The tubular needle isof the usual type adopted by dentists, and is furnished with a head.that abuts against the outer end of the piece D as indicated.

Both arms A are fitted in the same manner. I11 use the arms are closedfirmly onto the um of the patient so as to cause the local anestheticfluid into the gums of a paes 0, O to pierce the gum on opposite tientat two or more points oppositeeach sides thereof. During this operationthe other simultaneously. ressure on the needles or should the gum Mysaid improved syringe or enema combe very soft then the contact of thefaces of prises a pair of arms hinged or pivoted tothe caps P, P withthe gum causes the pieces gether after the manner of the arms of dentalD, D to move back and compress the elastic forceps or of scissors, andso constructed that cylinders E, E thereby contracting the chamthe oneaction ofclosing the arms will perbers B, B and consequently forcing outsome form the double operation of piercing the of the fluid contentswhich completely fills gums and injecting the fluid anesthetic. saidchambers. In this way the piercing of Referring to the accompanyingdrawings, the gum and the injection of the anesthetic Figure 1 is a faceview, and Fig. 2 is a side areIperformed by one operation. view of myimproved syringe or enema. he apparatus affords very eifective and Fig.3 is a section on the line as, 06, Fig. 2 drawn steady control of thewhole operation, and to a largerscale. Fig. 4 is a section also to amoreover enables the piercing and injecting larger scale illustrating amodification in to be done with one hand, the other hand bewhichasliding piston is used in lieu of a coming available for holding thecheek of the patient or for doing any other work which may pressiblechamber.

Like letters of reference denote correspondat the moment be required.ing parts in the severalfigures. I 1 f the pivot of the arms A is of theknown The apparatus shown comprises a air of type used in forceps whichallows of the arms pivoted arms A, A ada ted at one en to be beingreadily detached when desired, either grasped by the hand of theoperator and at half of the apparatus can be used as a single the otherend to receive the anesthetic fluid. piercer and injector in placeswhere the ese arms are suitably curved or bent to double arrangement.cannot be used. The enable the instrument to be conveniently apapparatusis shown provided with one needle plied to the gums of a atient. Theanesin each arm, but it is obvious that it may thetic fluid is containein a chamber B have two or more needles. formed in each arm byoppositely arranged In the arrangement shown in Fig. 4 in lieu rigidieces C, D and an elastic cylindrical of'a collapsible chamber I providea plunger piece The pieces 0, D are shown pro- R sliding through a cap Qand backed by a vided with cylindrical bosses F, G respec- "S. T'is apin rojecting from the side tively adapted to slide in apertures inplates of the plunger and s iding in a groove V in H, J carried by eacharm A. In the drawing the part W, said in serving to limit the outtheplate J is shownintegral with the arm A ward travel of t e lunger. Theneedle 0 and the late His attached to the arm by is supported by a hoder or ca P screwed on screws. t is obvious that both platesmay th 'endof the plunger, and the filling is efbe integral with the arm or bothmay be a t fected through an inlet L which is normally tached to thearm. p I i K, K, K are steadying pins fixed to the. pieces 0, D andassing through holes in'the plates H, J. T ese ins serve to preventturning of the pieces 6: D in the plates H, J. I

L is a filling inlet, and M is a cap for closing said inlet.

N is the outlet thoroughfare leading to the tion is similar to thatdescribed with reference to Fig. 3, the inward movement of the plungerwhen endwise pressure is applied theretoserving-to eject a proportion ofthe fluid contents.

What I claim is 1. A dental syringe or enema, comprising in combinationa pair of pivoted arms, a chamber in each arm for receiving liquidanesthetic, a movable part of said chamber serving to control the volumethereof, a tubular needle carried by said movable part, an inlet foradmitting liquid anesthetic, and a cap for closing said inlet.

2-. A dental syringe or enema comprising in combinationa pair of pivotedarms, ieces O, D mounted in said arms with a capa ility of slidingtherein, an elastic cylinder E. forming with thepieces C, D acollapsible chamber for receiving anesthetic fluid, a tubular needle 0supported by a cap P mounted on the piece D, said piece D having anoutlet channel communicating with the conduit in the tubular needle, andthe piece C having an inlet and a removable cap for closing; said inlet.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

RICHARD BRADBURY.

V' itnesses Gno. IlARRISON, HERBERT A. Bnnsron.

